Electronic Experimental Test Platform Hardware And Software Design

This paper mainly discusses the realization and design principle of experimental system-virtual instrument communicated with computer by Enhance Parallel Port. This system mainly consists of signal generation, high,speed data acquisition, series experimental circuit and corresponding soft.Lastly, we also analyse the errors Source of the system based on the data measured from the system,and give some anti-interference methods used in system.The signal generator is based on Direct Digital Synthesize, the maximal frequency of signal is 2.5MHz, the minimal frequency is 0.2Hz, its minimal resolution is 0.1Hz; in the module of data acquisition, we adopt a ADC which the range of sample frequency is 100KHz to 40MHz, and its resolution is 12 bits; the most digital logic is accomplished in CPLD (complex programmable logic device); the control and calculating is realized in computer, and the external hardware is communicated with computer by EPP of it; the software is programmed on the developing plat of Labwindows/CVI.Firstly this paper introduced the theory and technology of signal generator and data acquisition; secondly, it explains the realization of communication between system and computer, then it discusses the application of CPLD(complicated programmed logic device); last it describes programming environment.